很簡單直接上原始碼

import android.Manifest;
import android.content.pm.PackageManager;
import android.graphics.Color;
import android.graphics.SurfaceTexture;
import android.hardware.Camera;
import android.os.Bundle;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import
 
 android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.TextureView;
import android.view.View;
import android.widget.RelativeLayout;
import android.widget.TextView;

import java.io.IOException;

public class MainActivity extends AppCompatActivity {

    private TextureView mTextureView;
    private
 
 Camera mCamera;
    private SurfaceTexture mSurfaceTexture;
    private TextView mTextViewStart, mTextViewStop;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        init();
    }

    private
 
 void init() {
        mTextViewStart = (TextView) findViewById(R.id.act_main_textview_start);
        mTextViewStart.setOnClickListener(new CliclListener());
        mTextViewStop = (TextView) findViewById(R.id.act_main_textview_stop);
        mTextViewStop.setOnClickListener(new CliclListener());

        mTextureView = (TextureView) findViewById(R.id.act_main_textureview);
        mTextureView.setSurfaceTextureListener(new TextureView.SurfaceTextureListener() {
            @Override
            public void onSurfaceTextureAvailable(SurfaceTexture surface, int width, int height) {
                Log.i("aaa", "onSurfaceTextureAvailable  width:" + width + " height:" + height);
                mSurfaceTexture = surface;
            }

            @Override
            public void onSurfaceTextureSizeChanged(SurfaceTexture surface, int width, int height) {
                Log.i("aaa", "onSurfaceTextureSizeChanged  width:" + width + " height:" + height);
            }

            @Override
            public boolean onSurfaceTextureDestroyed(SurfaceTexture surface) {
                Log.i("aaa", "onSurfaceTextureDestroyed");
                stopPreviewCamera();
                return false;
            }

            @Override
            public void onSurfaceTextureUpdated(SurfaceTexture surface) {
                //                Log.i("aaa","onSurfaceTextureUpdated");
            }
        });
    }

    //開始預覽視屏
    private void startPreviewCamera() {
        mCamera = Camera.open();
        Camera.Size previewSize = mCamera.getParameters().getPreviewSize();
        Log.i("aaa", "previewSize.width:" + previewSize.width + "  previewSize.height:" + previewSize.height);
        RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(previewSize.width, previewSize.height);
        layoutParams.addRule(RelativeLayout.CENTER_HORIZONTAL);
        layoutParams.addRule(RelativeLayout.CENTER_VERTICAL);
        mTextureView.setLayoutParams(layoutParams);

        try {
            mCamera.setPreviewTexture(mSurfaceTexture);
        } catch (IOException e) {
            e.printStackTrace();
        }
        mCamera.startPreview();
        mTextureView.setAlpha(1.0f);
        mTextureView.setRotation(90.0f);
    }

    private void stopPreviewCamera() {
        mCamera.stopPreview();
        mCamera.release();
    }

    //檢查拍照許可權
    private void checkCameraPermission() {
        if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED) {
            Log.i("aaa", "已經獲取許可權");
        } else {
            ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.CAMERA}, 1);//1 can be another integer
        }
    }

    private class CliclListener implements View.OnClickListener {

        @Override
        public void onClick(View v) {
            switch (v.getId()) {
                case R.id.act_main_textview_start:
                    checkCameraPermission();
                    startPreviewCamera();
                    break;
                case R.id.act_main_textview_stop:
                    stopPreviewCamera();
                    mTextureView.setBackgroundColor(Color.WHITE);
                    break;
            }
        }
    }
}

佈局檔案：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
          package="com.test.wb.textureviewtest">

    <uses-sdk
        android:minSdkVersion="16"
        android:targetSdkVersion="22" />
    <!-- 增加檔案儲存和訪問攝像頭的許可權 -->
    <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.CAMERA"/>

    <uses-feature android:name="android.hardware.camera"/>
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>

                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
        </activity>
    </application>

</manifest>